Honor -fuse-init-array when os is not specified on x86

Currently -fuse-init-array option is not effective when target triple
does not specify os, on x86,x86_64.
i.e.

// -fuse-init-array is not honored.
$ clang -target i386 -fuse-init-array test.c -S

// -fuse-init-array is honored.
$ clang -target i386-linux -fuse-init-array test.c -S

This patch fixes first case.
And does cleanup.

Reviewers: rnk, craig.topper, fhahn, echristo

Reviewed By: rnk

Differential Revision: https://reviews.llvm.org/D71360

Author: kamleshbhalui

llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp

@@ -97,6 +97,7 @@ void TargetLoweringObjectFileELF::Initialize(MCContext &Ctx,
   TM = &TgtM;
 
   CodeModel::Model CM = TgtM.getCodeModel();
+  InitializeELF(TgtM.Options.UseInitArray);
 
   switch (TgtM.getTargetTriple().getArch()) {
   case Triple::arm:

llvm/lib/Target/AArch64/AArch64TargetObjectFile.cpp

@@ -20,7 +20,6 @@ using namespace dwarf;
 void AArch64_ELFTargetObjectFile::Initialize(MCContext &Ctx,
                                              const TargetMachine &TM) {
   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
-  InitializeELF(TM.Options.UseInitArray);
   // AARCH64 ELF ABI does not define static relocation type for TLS offset
   // within a module.  Do not generate AT_location for TLS variables.
   SupportDebugThreadLocalLocation = false;

llvm/lib/Target/Hexagon/HexagonTargetObjectFile.cpp

@@ -112,7 +112,6 @@ static const char *getSectionSuffixForSize(unsigned Size) {
 void HexagonTargetObjectFile::Initialize(MCContext &Ctx,
       const TargetMachine &TM) {
   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
-  InitializeELF(TM.Options.UseInitArray);
 
   SmallDataSection =
     getContext().getELFSection(".sdata", ELF::SHT_PROGBITS,

llvm/lib/Target/Lanai/LanaiTargetObjectFile.cpp

@@ -28,7 +28,6 @@ static cl::opt<unsigned> SSThreshold(
 void LanaiTargetObjectFile::Initialize(MCContext &Ctx,
                                        const TargetMachine &TM) {
   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
-  InitializeELF(TM.Options.UseInitArray);
 
   SmallDataSection = getContext().getELFSection(
       ".sdata", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);

llvm/lib/Target/Mips/MipsTargetObjectFile.cpp

@@ -44,7 +44,6 @@ EmbeddedData("membedded-data", cl::Hidden,
 
 void MipsTargetObjectFile::Initialize(MCContext &Ctx, const TargetMachine &TM){
   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
-  InitializeELF(TM.Options.UseInitArray);
 
   SmallDataSection = getContext().getELFSection(
       ".sdata", ELF::SHT_PROGBITS,

llvm/lib/Target/PowerPC/PPCTargetObjectFile.cpp

@@ -18,7 +18,6 @@ void
 PPC64LinuxTargetObjectFile::
 Initialize(MCContext &Ctx, const TargetMachine &TM) {
   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
-  InitializeELF(TM.Options.UseInitArray);
 }
 
 MCSection *PPC64LinuxTargetObjectFile::SelectSectionForGlobal(

llvm/lib/Target/RISCV/RISCVTargetObjectFile.cpp

@@ -17,7 +17,6 @@ using namespace llvm;
 void RISCVELFTargetObjectFile::Initialize(MCContext &Ctx,
                                           const TargetMachine &TM) {
   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
-  InitializeELF(TM.Options.UseInitArray);
 
   SmallDataSection = getContext().getELFSection(
       ".sdata", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);

llvm/lib/Target/Sparc/SparcTargetObjectFile.cpp

@@ -17,7 +17,6 @@ using namespace llvm;
 void SparcELFTargetObjectFile::Initialize(MCContext &Ctx,
                                           const TargetMachine &TM) {
   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
-  InitializeELF(TM.Options.UseInitArray);
 }
 
 const MCExpr *SparcELFTargetObjectFile::getTTypeGlobalReference(

llvm/lib/Target/X86/X86TargetMachine.cpp

@@ -92,19 +92,9 @@ static std::unique_ptr<TargetLoweringObjectFile> createTLOF(const Triple &TT) {
     return std::make_unique<TargetLoweringObjectFileMachO>();
   }
 
-  if (TT.isOSFreeBSD())
-    return std::make_unique<X86FreeBSDTargetObjectFile>();
-  if (TT.isOSLinux() || TT.isOSNaCl() || TT.isOSIAMCU())
-    return std::make_unique<X86LinuxNaClTargetObjectFile>();
-  if (TT.isOSSolaris())
-    return std::make_unique<X86SolarisTargetObjectFile>();
-  if (TT.isOSFuchsia())
-    return std::make_unique<X86FuchsiaTargetObjectFile>();
-  if (TT.isOSBinFormatELF())
-    return std::make_unique<X86ELFTargetObjectFile>();
   if (TT.isOSBinFormatCOFF())
     return std::make_unique<TargetLoweringObjectFileCOFF>();
-  llvm_unreachable("unknown subtarget type");
+  return std::make_unique<X86ELFTargetObjectFile>();
 }
 
 static std::string computeDataLayout(const Triple &TT) {

llvm/lib/Target/X86/X86TargetObjectFile.cpp

@@ -65,28 +65,7 @@ const MCExpr *X86ELFTargetObjectFile::getDebugThreadLocalSymbol(
 }
 
 void
-X86FreeBSDTargetObjectFile::Initialize(MCContext &Ctx,
+X86ELFTargetObjectFile::Initialize(MCContext &Ctx,
                                        const TargetMachine &TM) {
   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
-  InitializeELF(TM.Options.UseInitArray);
-}
-
-void
-X86FuchsiaTargetObjectFile::Initialize(MCContext &Ctx,
-                                       const TargetMachine &TM) {
-  TargetLoweringObjectFileELF::Initialize(Ctx, TM);
-  InitializeELF(TM.Options.UseInitArray);
-}
-
-void
-X86LinuxNaClTargetObjectFile::Initialize(MCContext &Ctx,
-                                         const TargetMachine &TM) {
-  TargetLoweringObjectFileELF::Initialize(Ctx, TM);
-  InitializeELF(TM.Options.UseInitArray);
-}
-
-void X86SolarisTargetObjectFile::Initialize(MCContext &Ctx,
-                                            const TargetMachine &TM) {
-  TargetLoweringObjectFileELF::Initialize(Ctx, TM);
-  InitializeELF(TM.Options.UseInitArray);
 }